# What GDP measures

Informational only - not investment advice.

Book: [Reading Financial Data - Step by Step](/guide/)
Chapter: [Economic indicators](/guide/economic-indicators/)
As of: 2026-01-01

Real GDP measures economy-wide output after adjusting for price changes.

## Concept

GDPC1 is reported in billions of chained 2017 dollars. Chained dollars adjust for inflation so you can compare the actual volume of economic activity across years, not just price changes.

## Worked Example: Read the latest real GDP level

1. GDPC1's latest observation is 24,152.656 billion chained 2017 dollars on 2026-01-01.
2. That is about $24,152.7 billion in chained 2017 dollars.
3. The word real means the series is adjusted for prices; chained dollars are the plain-language reason you can compare output across years.

## See it live

- [GDPC1 indicator page](/indicator/GDPC1/)

## Sources

- [GDPC1 source](https://fred.stlouisfed.org/series/GDPC1)